JP7020716B1 - paint remover - Google Patents
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- JP7020716B1 JP7020716B1 JP2020202635A JP2020202635A JP7020716B1 JP 7020716 B1 JP7020716 B1 JP 7020716B1 JP 2020202635 A JP2020202635 A JP 2020202635A JP 2020202635 A JP2020202635 A JP 2020202635A JP 7020716 B1 JP7020716 B1 JP 7020716B1
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- release agent
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- methylethanolamine
- xanthan gum
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- 239000003973 paint Substances 0.000 title description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 65
- 235000010493 xanthan gum Nutrition 0.000 claims abstract description 21
- 239000000230 xanthan gum Substances 0.000 claims abstract description 21
- 229920001285 xanthan gum Polymers 0.000 claims abstract description 21
- 229940082509 xanthan gum Drugs 0.000 claims abstract description 21
- OPKOKAMJFNKNAS-UHFFFAOYSA-N N-methylethanolamine Chemical compound CNCCO OPKOKAMJFNKNAS-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003513 alkali Substances 0.000 claims abstract description 20
- 239000003518 caustics Substances 0.000 claims abstract description 18
- 239000003849 aromatic solvent Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- WVDDGKGOMKODPV-UHFFFAOYSA-N Benzyl alcohol Chemical group OCC1=CC=CC=C1 WVDDGKGOMKODPV-UHFFFAOYSA-N 0.000 claims description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 235000019445 benzyl alcohol Nutrition 0.000 claims description 5
- 239000002562 thickening agent Substances 0.000 abstract description 14
- 230000006866 deterioration Effects 0.000 abstract description 8
- 239000003381 stabilizer Substances 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 abstract 1
- 238000002156 mixing Methods 0.000 description 18
- 238000000576 coating method Methods 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 11
- 239000007788 liquid Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 238000000926 separation method Methods 0.000 description 5
- 241000218645 Cedrus Species 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000007665 sagging Methods 0.000 description 3
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000002738 chelating agent Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910001854 alkali hydroxide Inorganic materials 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000003352 sequestering agent Substances 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Detergent Compositions (AREA)
- Paints Or Removers (AREA)
Abstract
【課題】充分な剥離性能を備えながら、適正な粘度がより長期に亘って維持される剥離剤を得る。【解決手段】本発明の剥離剤は、０．１～５重量％の苛性アルカリと、５～３０重量％の芳香族系溶剤と、０．７～５重量％のキサンタンガムと、１～１０重量％のＮ－メチルエタノールアミンと、６０～９０重量％の水とを含有する。このように、増粘剤としてキサンタンガムを採用することに加えて、安定剤としてＮ－メチルエタノールアミンを配合すると、剥離剤の粘度特性の経時劣化が抑えられ、より長期に亘って剥離剤の粘度を適正に維持することができる。【選択図】なしPROBLEM TO BE SOLVED: To obtain a peeling agent having sufficient peeling performance and maintaining an appropriate viscosity for a longer period of time. The release agent of the present invention contains 0.1 to 5% by weight of a caustic alkali, 5 to 30% by weight of an aromatic solvent, 0.7 to 5% by weight of xanthan gum, and 1 to 10% by weight. It contains% N-methylethanolamine and 60-90% by weight of water. As described above, when xanthan gum is used as a thickener and N-methylethanolamine is added as a stabilizer, the deterioration of the viscosity characteristics of the release agent over time is suppressed, and the viscosity of the release agent is extended over a longer period of time. Can be maintained properly. [Selection diagram] None
Description
本発明は、塗膜等を剥離、除去するために使用される剥離剤に関する。 The present invention relates to a release agent used for removing or removing a coating film or the like.
苛性アルカリと芳香族系アルコールとを含む剥離剤は公知であり、例えば特許文献１には、アルカリ金属水酸化物又は（メタ）ケイ酸塩０．１～１０重量％と、ベンジルアルコールなどの芳香族系アルコール０．５～１０重量％と、水８０～９９．４重量％とを含有してなるエッチングレジスト膜用剥離液が開示されている。 A release agent containing a caustic alkali and an aromatic alcohol is known. For example, in Patent Document 1, an alkali metal hydroxide or (meth) silicate 0.1 to 10% by weight and an aromatic such as benzyl alcohol are known. A stripping solution for an etching resist film containing 0.5 to 10% by weight of a group alcohol and 80 to 99.4% by weight of water is disclosed.
苛性アルカリと芳香族系アルコールとを含む剥離剤に、アルカノールアミンを混合することも公知であり、特許文献２には、剥離剤１００質量％中、無機アルカリ化合物を５～４０質量％、アルカノールアミンを１０～５０質量％、芳香族アルコールを１０～５０質量％含む剥離剤が開示されている。特許文献３には、水酸化アルカリ０．１～５重量％、芳香族系アルコール５～９３．８重量％、アルカノールアミン５～６０重量％、グリコール類０．１～３０重量％、及び水１～５０重量％を含有してなる水溶性塗料剥離剤が開示されている。 It is also known to mix an alkanolamine with a release agent containing a caustic alkali and an aromatic alcohol. In Patent Document 2, 5 to 40% by mass of an inorganic alkali compound and an alkanolamine in 100% by mass of the release agent are used. A release agent containing 10 to 50% by mass and 10 to 50% by mass of aromatic alcohol is disclosed. Patent Document 3 describes 0.1 to 5% by weight of alkali hydroxide, 5 to 93.8% by weight of aromatic alcohol, 5 to 60% by weight of alkanolamine, 0.1 to 30% by weight of glycols, and 1 of water. A water-soluble paint remover containing up to 50% by weight is disclosed.
この種の剥離剤には、塗布性に優れ、剥離対象である塗膜に塗布された後に液だれせずに塗膜に密着して留まることが求められる。このため剥離剤に増粘剤を添加して粘度向上を図ることは公知技術であり、例えば特許文献３には「本発明による塗料剥離剤に、必要に応じて適宜、防錆剤、界面活性剤、キレート剤、粘度調整剤、等を添加することができる。」と記載されている。特許文献４には、水溶性アミン、特定の芳香族アルコール、金属イオン封鎖剤、界面活性剤、および水からなる保護塗膜の除去用洗浄剤において、増粘剤としてアルギン酸ナトリウムを使用することができることが開示されている。 This type of release agent is required to have excellent coatability and to stay in close contact with the coating film without dripping after being applied to the coating film to be peeled off. Therefore, it is a known technique to add a thickener to a release agent to improve the viscosity. For example, Patent Document 3 states that "the paint release agent according to the present invention has a rust preventive agent and a surface activity as appropriate. Agents, chelating agents, viscosity modifiers, etc. can be added. " Patent Document 4 describes the use of sodium alginate as a thickener in a cleaning agent for removing a protective coating film consisting of a water-soluble amine, a specific aromatic alcohol, a sequestrant, a surfactant, and water. It is disclosed that it can be done.
本発明者等は、上記のような苛性アルカリと芳香族系アルコールとを含む剥離剤において、適切な粘度を備えているだけでなく、当該粘度がより長期に亘って維持されることを目標として開発を行った。つまり、本発明者等の知見によれば、この種の苛性アルカリと芳香族系アルコールとを含む剥離剤には、種々の配合割合からなる様々な態様の剥離剤が市場に存在するものの、それらは総じて粘度が低く、剥離対象である塗膜に塗布されたのちに液だれせずに塗膜に密着して留めておくことは困難であり、結果として塗膜内への浸潤性能が不良となり易いという問題があった。また、この問題は、剥離剤に増粘剤を加えることで解決できるものの、苛性アルカリが配合された強アルカリ水溶液中において、１年以上の長期に亘って適切な粘度特性が維持される剥離剤は実在しないというのが実情であり、この点に改良の余地があった。 The present inventors have aimed not only to have an appropriate viscosity in a release agent containing a caustic alkali and an aromatic alcohol as described above, but also to maintain the viscosity for a longer period of time. Developed. That is, according to the findings of the present inventors, although there are various types of release agents having various blending ratios in the release agent containing this kind of caustic alkali and aromatic alcohol, they are available on the market. Has a low viscosity as a whole, and after being applied to the coating film to be peeled off, it is difficult to keep it in close contact with the coating film without dripping, resulting in poor infiltration performance into the coating film. There was a problem that it was easy. Further, although this problem can be solved by adding a thickener to the release agent, the release agent maintains an appropriate viscosity property for a long period of one year or more in a strong alkaline aqueous solution containing a caustic alkali. The fact is that does not actually exist, and there was room for improvement in this regard.
本発明は以上のような従来の剥離剤の抱える問題を解決するためになされたものであり、充分な剥離性能を備えながら、適正な粘度がより長期に亘って維持される剥離剤を得ることを目的とする。 The present invention has been made to solve the above-mentioned problems of conventional release agents, and to obtain a release agent having sufficient release performance and maintaining an appropriate viscosity for a longer period of time. With the goal.
本発明者等は、増粘剤としてキサンタンガムを採用することに加えて、安定剤としてＮ－メチルエタノールアミンを配合すると、剥離剤の粘度特性の経時劣化が抑えられ、より長期に亘って良好な粘度が維持されることを見出して、本発明を完成するに至った。 In addition to adopting xanthan gum as a thickener, the present inventors can suppress deterioration of the viscosity characteristics of the release agent over time by adding N-methylethanolamine as a stabilizer, which is good for a longer period of time. We have found that the viscosity is maintained, and have completed the present invention.
すなわち、本発明の剥離剤は、０．１重量％以上、５重量％以下の苛性アルカリと、５重量％以上、３０重量％以下の芳香族系溶剤と、０．７重量％以上、５重量％以下のキサンタンガムと、１重量％以上、１０重量％以下のＮ－メチルエタノールアミンと、６０重量％以上、９０重量％以下の水とを含有することを特徴とする。 That is, the release agent of the present invention contains a caustic alkali of 0.1% by weight or more and 5% by weight or less, an aromatic solvent of 5% by weight or more and 30% by weight or less, and 0.7% by weight or more and 5% by weight. It is characterized by containing xantan gum of% or less, N-methylethanolamine of 1% by weight or more and 10% by weight or less, and water of 60% by weight or more and 90% by weight or less.
キサンタンガムの含有量が０．７重量％以上、１．５重量％以下であり、Ｎ－メチルエタノールアミンの含有量は１重量％以上、５重量％以下であることが望ましい。 It is desirable that the content of xanthan gum is 0.7% by weight or more and 1.5% by weight or less, and the content of N-methylethanolamine is 1% by weight or more and 5% by weight or less.
苛性アルカリが水酸化ナトリウムであり、芳香族系溶剤がベンジルアルコールであることが望ましい。 It is desirable that the caustic alkali is sodium hydroxide and the aromatic solvent is benzyl alcohol.
本発明の剥離剤のように、苛性アルカリと芳香族系溶剤とを配合していると、苛性アルカリに由来する油溶性塗料に対する剥離作用と、芳香族系溶剤に由来する水溶性塗料に対する剥離作用の両作用が得られるため、油溶性塗料の塗膜と水溶性塗料の塗膜の両種の塗膜に対する良好な剥離作用を発揮する剥離剤を得ることができる。また、本発明のように、増粘剤であるキサンタンガムを剥離剤に配合していると、粘度特性の向上を図って、適正な粘度を剥離剤に付与することができる。そのうえで、Ｎ－メチルエタノールアミンを配合していると、増粘剤であるキサンタンガムに由来する粘度特性が経時劣化することを効果的に抑えることできるので、より長期に亘って適正な粘度を発揮する剥離剤を得ることができる。剥離剤の分離を抑えて、液安定性の向上を図ることもできる。 When a caustic alkali and an aromatic solvent are blended like the release agent of the present invention, the release action on the oil-soluble paint derived from the caustic alkali and the peeling action on the water-soluble paint derived from the aromatic solvent. Since both of these actions are obtained, it is possible to obtain a release agent that exhibits good peeling action on both types of coatings, that is, a coating film of an oil-soluble paint and a coating film of a water-soluble paint. Further, when xanthan gum, which is a thickener, is blended in the release agent as in the present invention, it is possible to improve the viscosity characteristics and impart an appropriate viscosity to the release agent. In addition, when N-methylethanolamine is blended, it is possible to effectively suppress the deterioration of the viscosity characteristics derived from the thickener xanthan gum over time, so that the appropriate viscosity is exhibited for a longer period of time. A release agent can be obtained. It is also possible to suppress the separation of the release agent and improve the liquid stability.
具体的には、苛性アルカリは、主として油溶性塗料の剥離に効果を発揮するものであり、その配合割合は、０．１重量％以上、５重量％以下であることが好ましい。０．１重量％未満では苛性アルカリに由来する剥離剤の塗膜への浸透性又は剥離速度の増大効果が充分に得られない。５重量％を超えても浸透性又は剥離速度の増大効果はそれ程大きくならず、却って剥離剤のコストアップを招来する。５重量％を超えて苛性アルカリの濃度が高くなると、使用後の廃液処理に手間がかかる不利もある。苛性アルカリは水酸化ナトリウムが最適である。 Specifically, the caustic alkali is mainly effective for peeling off the oil-soluble paint, and the blending ratio thereof is preferably 0.1% by weight or more and 5% by weight or less. If it is less than 0.1% by weight, the effect of increasing the permeability of the release agent derived from caustic alkali to the coating film or the release rate cannot be sufficiently obtained. Even if it exceeds 5% by weight, the effect of increasing the permeability or the peeling speed is not so large, and on the contrary, the cost of the peeling agent is increased. If the concentration of caustic alkali exceeds 5% by weight, there is a disadvantage that it takes time and effort to dispose of the waste liquid after use. Sodium hydroxide is the most suitable caustic alkali.
芳香族系溶剤は、主として水溶性塗料の剥離に効果を発揮するものであり、その配合割合は、５重量％以上、３０重量％以下であることが好ましい。５重量％未満では芳香族系溶剤に由来する塗膜の剥離除去効果が少なく、３０重量％を超えると塗膜が設けられた基材の表面の溶解や膨潤を引き起こすおそれがある。芳香族系溶剤はベンジルアルコールが最適である。 The aromatic solvent is mainly effective for peeling off the water-soluble paint, and the blending ratio thereof is preferably 5% by weight or more and 30% by weight or less. If it is less than 5% by weight, the effect of removing the peeling of the coating film derived from the aromatic solvent is small, and if it exceeds 30% by weight, it may cause dissolution or swelling of the surface of the base material on which the coating film is provided. Benzyl alcohol is the most suitable aromatic solvent.
本発明に係る剥離剤には苛性アルカリが配合されているため、当該剥離剤はｐＨ１４程度の強アルカリの水溶液となる。このため剥離剤に粘度を付与する増粘剤には、強アルカリ環境下でも安定的に粘度特性を発揮することが求められ、本発明者の知見によればキサンタンガムが好適である。かかるキサンタンガムの配合割合は、０．７重量％以上、５重量％以下であることが好ましく、０．７重量％を下回ると充分な粘度が得られない。他方で５重量％を超えると、粘度は高くなるものの塗工性が不良となる。また、キサンタンガムの含有量は、０．７重量％以上、１．５重量％以下であることがより好ましい。これは、１．５重量％を超えると、塗工性が若干不良となることとに拠る。 Since the release agent according to the present invention contains caustic alkali, the release agent is an aqueous solution of a strong alkali having a pH of about 14. Therefore, the thickener that imparts viscosity to the release agent is required to stably exhibit viscosity characteristics even in a strong alkaline environment, and according to the knowledge of the present inventor, xanthan gum is suitable. The blending ratio of the xanthan gum is preferably 0.7% by weight or more and 5% by weight or less, and if it is less than 0.7% by weight, sufficient viscosity cannot be obtained. On the other hand, if it exceeds 5% by weight, the viscosity becomes high but the coatability becomes poor. Further, the content of xanthan gum is more preferably 0.7% by weight or more and 1.5% by weight or less. This is because if it exceeds 1.5% by weight, the coatability becomes slightly poor.
上記のようなキサンタンガムを配合したことで得られる粘度特性の向上効果は、それだけでは長期に亘って維持されず、数か月程度で粘度は低下しやすい。また、上記のような苛性アルカリと芳香剤系溶剤とを含む剥離剤は分離しやすい。これら不都合を解決するため、本発明においては、Ｎ－メチルエタノールアミンを少量配合することで、粘度特性の経時的劣化を抑えて、より長期に亘って粘度が良好に維持されるようにしている。またＮ－メチルエタノールアミンを少量配合することで、剥離剤の液安定性の向上を図って、剥離剤が分離することを防いでいる。 The effect of improving the viscosity characteristics obtained by blending the above-mentioned xanthan gum is not maintained for a long period of time by itself, and the viscosity tends to decrease in about several months. Further, the release agent containing the caustic alkali and the fragrance-based solvent as described above is easy to separate. In order to solve these inconveniences, in the present invention, by blending a small amount of N-methylethanolamine, deterioration of the viscosity characteristics over time is suppressed, and the viscosity is maintained at a good level for a longer period of time. .. Further, by blending a small amount of N-methylethanolamine, the liquid stability of the release agent is improved and the release agent is prevented from separating.
かかるＮ－メチルエタノールアミンの配合割合は、１重量％以上、１０重量％以下であることが望ましく、１重量％を下回ると、先のＮ－メチルエタノールアミンに由来する粘度特性の維持効果と液安定性の向上効果が得られない。１０重量％を超えると、却って粘度は低下しやすくなり、液安定性の向上効果も得られない。Ｎ－メチルエタノールアミンの含有量は１重量％以上、５重量％以下であることがより好ましい。これは５重量％を超えると、１年程度の経過後に若干の分離が見られ、粘度も若干低下することに拠る。 The blending ratio of such N-methylethanolamine is preferably 1% by weight or more and 10% by weight or less, and when it is less than 1% by weight, the effect of maintaining the viscosity characteristics derived from the above N-methylethanolamine and the liquid The effect of improving stability cannot be obtained. If it exceeds 10% by weight, the viscosity tends to decrease, and the effect of improving the liquid stability cannot be obtained. The content of N-methylethanolamine is more preferably 1% by weight or more and 5% by weight or less. This is because when it exceeds 5% by weight, some separation is observed after about one year, and the viscosity also slightly decreases.
水を配合していると、剥離剤が乾燥することを抑えることができる。また、水を配合することで、引火点をなくすことができるので、安全性に優れた剥離剤を得ることができる。この水の配合割合は、６０重量％以上、９０重量％以下であることが望ましい。 When water is added, it is possible to prevent the release agent from drying. Further, by blending water, the flash point can be eliminated, so that a release agent having excellent safety can be obtained. It is desirable that the mixing ratio of this water is 60% by weight or more and 90% by weight or less.
（増粘剤の選定）
下記の表１、２に示すように、異なる増粘剤が配合されたＮо．１～７の剥離剤を作成し、各剥離剤の粘度特性について観察した。その結果を表２に示す。
(Selection of thickener)
As shown in Tables 1 and 2 below, Nо. 1 to 7 release agents were prepared, and the viscosity characteristics of each release agent were observed. The results are shown in Table 2.
以上より、水酸化ナトリウムとベンジルアルコールとを含む剥離剤の増粘剤としては、キサンタンガムが好適であるとの知見を得た。 From the above, it was found that xanthan gum is suitable as a thickener for a stripping agent containing sodium hydroxide and benzyl alcohol.
（安定化剤の特定）
上記のように本発明の剥離剤の増粘剤としてはキサンタンガムが好適であるが、それだけでは液安定性に乏しく、数週間程度で剥離剤が分離し、或いは粘度特性が劣化する。このため、本発明者等は、剥離剤の安定性の向上を図り、粘度特性の劣化を抑えるためには、何らかの安定化剤を配合することが必要であると考えて、以下の表３のような組成でＮо．１～５の剥離剤を作成し、各剥離剤について液安定性や粘度特性の経時的変化を観察した。その結果を表４に示す。
(Specification of stabilizer)
As described above, xanthan gum is suitable as the thickener of the release agent of the present invention, but the liquid stability is poor by itself, and the release agent separates or the viscosity characteristics deteriorate in about several weeks. Therefore, the present inventors consider that it is necessary to add some kind of stabilizer in order to improve the stability of the release agent and suppress the deterioration of the viscosity characteristics, and the following Table 3 shows. With the same composition, Nо. 1 to 5 release agents were prepared, and changes in liquid stability and viscosity characteristics with time were observed for each release agent. The results are shown in Table 4.
以上より、増粘剤であるキサンタンガムに由来する粘度特性を維持するとともに、剥離液の分離を防ぐためには、Ｎ－メチルエタノールアミンが好適である。つまり、増粘剤としてのキサンタンガムと、安定化剤としてのＮ－メチルエタノールアミンとの組み合わせにより、剥離剤の液安定性の向上を図るとともに、粘度特性の経時的劣化を抑えることができる。 From the above, N-methylethanolamine is suitable for maintaining the viscosity characteristics derived from the thickener xanthan gum and preventing the separation of the stripping solution. That is, by combining xanthan gum as a thickener and N-methylethanolamine as a stabilizer, it is possible to improve the liquid stability of the release agent and suppress deterioration of viscosity characteristics over time.
（キサンタンガムの配合割合）
以下の表５に示すようにキサンタンガムの配合割合を変化させて、Ｎо．１～１０の剥離剤を作成した。また、各剥離剤について、粘度特性と液安定性について評価した。その結果を表６に示す。
(Mixing ratio of xanthan gum)
As shown in Table 5 below, the blending ratio of xanthan gum was changed to Nо. 1 to 10 release agents were prepared. In addition, the viscosity characteristics and liquid stability of each release agent were evaluated. The results are shown in Table 6.
粘度特性について
低い ：粘度が低く、液だれが発生する。
滑らか ：粘度が適切であり、液だれは発生せず、塗工性も良好である。
少し高い：粘度が若干高く、液だれは発生しないが、塗工性が若干不良となる。
高い ：粘度が高く、液だれは発生しないが、塗工性が非常に悪い。
Low viscosity characteristics: Low viscosity and dripping occurs.
Smoothness: Appropriate viscosity, no dripping, and good coatability.
Slightly high: The viscosity is slightly high and no dripping occurs, but the coatability is slightly poor.
High: High viscosity, no dripping, but very poor coatability.
なお、上記の「液だれ」については、具体的には以下のように評価した。
一般的に奨励される剥離剤塗布量である４００～５００ｇ／ｍ２の中間値である４５０ｇ／ｍ２を目安として、準備した杉板（７５ｍｍ×１５０ｍｍ）の表面に５．１ｇに計量した剥離剤をへらでできるだけ均一となるように塗布した。塗布後、杉板を計量して、５．１ｇの剥離剤が塗布されていることを確認した。計量後、直ちに杉板を垂直に立て掛け、１０分後に塗布した剥離剤のタレ等の付着状態を確認した。
そして、タレが確認できない場合には「〇：液だれ発生せず」と評価し、５ミリ以下のタレが確認された場合には「△：若干の液だれが見られる」、５ミリを超えるタレが確認された場合には「×：液だれがみられる」と評価した。
なお、上記のＮо．１～１０の剥離剤では、Ｎо．１において５ミリを超えるタレが確認されたため、「×」と評価し、それ以外のＮо．２～１０については液だれは見られなかったため、「〇」と評価した。
The above-mentioned "dripping" was specifically evaluated as follows.
Weighing 5.1 g on the surface of the prepared cedar board (75 mm x 150 mm) with 450 g / m 2 , which is an intermediate value of 400 to 500 g / m 2 , which is the generally recommended amount of release agent applied, as a guide. The agent was applied with a spatula so as to be as uniform as possible. After the application, the cedar board was weighed and it was confirmed that 5.1 g of the release agent was applied. Immediately after weighing, the cedar board was erected vertically, and 10 minutes later, the adhered state of the applied release agent such as sagging was confirmed.
If no dripping can be confirmed, it is evaluated as "○: no dripping occurs", and if dripping of 5 mm or less is confirmed, "△: some dripping is seen", exceeding 5 mm. When sagging was confirmed, it was evaluated as "x: dripping is observed".
In addition, the above Nо. For 1 to 10 release agents, Nо. Since a sagging of more than 5 mm was confirmed in 1, it was evaluated as "x", and other Nо. No dripping was observed for 2 to 10, so the evaluation was "○".
以上より、キサンタンガムの配合割合としては、０．７重量％以上、５重量％以下であることが好ましく、より好ましくは０．７重量％以上、１．５重量％以下であることが確認できた。 From the above, it was confirmed that the blending ratio of xanthan gum is preferably 0.7% by weight or more and 5% by weight or less, more preferably 0.7% by weight or more and 1.5% by weight or less. ..
（Ｎ－メチルエタノールアミンの配合割合）
以下の表７に示すようにＮ－メチルエタノールアミンの配合割合を変化させて、Ｎо．１～４の剥離剤を作成した。また、各剥離剤について、粘度特性の劣化と、液安定性を評価した。その結果を表８に示す。
(Mixing ratio of N-methylethanolamine)
As shown in Table 7 below, the mixing ratio of N-methylethanolamine was changed to Nо. 1 to 4 release agents were prepared. In addition, the deterioration of viscosity characteristics and liquid stability of each release agent were evaluated. The results are shown in Table 8.
なお、液安定性については、分離の有無を目視にて確認した。粘度特性については、上述の「液だれ」の評価基準にしたがって評価した。 Regarding the liquid stability, the presence or absence of separation was visually confirmed. The viscosity characteristics were evaluated according to the above-mentioned evaluation criteria of "dripping".
以上より、Ｎ－メチルエタノールアミンの配合割合としては、１重量％以上、１０重量％以下であることが好ましく、より好ましくは１重量％以上、５重量％以下であることが確認できた。 From the above, it was confirmed that the blending ratio of N-methylethanolamine is preferably 1% by weight or more and 10% by weight or less, more preferably 1% by weight or more and 5% by weight or less.
以上の実施例により明らかなように、水酸化ナトリウムとベンジルアルコールとに由来する剥離機能を発揮する剥離剤の増粘剤としてはキサンタンガムが好適であること、および当該剥離剤の分離を防ぐこと、或いは粘度特性の劣化防止を図るために剥離剤に添加される安定化剤としては、Ｎ－メチルエタノールアミンが好適であることが確認された。また、特に当該剥離剤におけるキサンタンガムの配合割合としては０．７～５重量％が好適であること、およびＮ－メチルエタノールアミンの配合割合としては１～１０重量％が好適であることが確認できた。 As is clear from the above examples, xanthan gum is suitable as a thickener for a release agent that exhibits a release function derived from sodium hydroxide and benzyl alcohol, and prevention of separation of the release agent. Alternatively, it was confirmed that N-methylethanolamine is suitable as the stabilizer added to the release agent in order to prevent deterioration of the viscosity characteristics. Further, it can be confirmed that the blending ratio of xanthan gum in the release agent is particularly preferably 0.7 to 5% by weight, and the blending ratio of N-methylethanolamine is preferably 1 to 10% by weight. rice field.
本発明に係る剥離剤には、適宜、防錆剤、界面活性剤、キレート剤、等を添加することができる。 A rust preventive, a surfactant, a chelating agent, etc. can be appropriately added to the release agent according to the present invention.
Claims (3)
５～３０重量％の芳香族系溶剤と、
０．７～５重量％のキサンタンガムと、
１～１０重量％のＮ－メチルエタノールアミンと、
６０～９０重量％の水と、
を含有することを特徴とする剥離剤。 0.1-5% by weight of caustic alkali and
With 5 to 30% by weight of aromatic solvent,
With 0.7-5% by weight xanthan gum,
With 1-10% by weight N-methylethanolamine,
With 60-90% by weight of water,
A release agent characterized by containing.
Ｎ－メチルエタノールアミンの含有量が１～５重量％である、請求項１に記載の剥離剤。 The content of xanthan gum is 0.7-1.5% by weight,
The release agent according to claim 1, wherein the content of N-methylethanolamine is 1 to 5% by weight.
芳香族系溶剤がベンジルアルコールである、請求項１又は２に記載の剥離剤。 The caustic alkali is sodium hydroxide,
The release agent according to claim 1 or 2, wherein the aromatic solvent is benzyl alcohol.
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